0:00 This is How to Soundproof a Ceiling from Hush Soundproofing in New York City. Soundproofing is the combination of multiple noise reduction techniques, there is no single solution for how to soundproofing a room or ceiling.

0:48 FILL GAPS AND CRACKS (Spray Foam, Acoustical Caulk)
First, seal all cracks and gaps with acoustical caulk such as quiet seal pro or green glue noiseproofing sealant. Additionally, spray foam is used to fill in larger gaps. The excess spray foam can be cut back, and if necessary, you can seal the foam with one of the above acoustical caulking products. One small crack, in particular, can transfer upwards to 50% of the sound originating on the other side of a surface. Consequently, it’s very important to make sure you get into and around all pipes and holes for electrical as well as ductwork. Every single hole you find needs to be filled, so make no exception.  

Spray Foam [ Ссылка ]

1:31 DAMPING/ SOUND DEADENING/ SHEETROCK + MLV(Sound Deadening Materials, Soundproof Clay, Damping Sheets)
In the case of soundproofing a room, you must seal around under and above, everything possible. Cover all outlets and electric boxes for lights and light switches with quiet putty. Get up into the ceiling and cover all ductwork with neoprene duct insulation. Some scenarios will require sound damping sheets to help damp resonating sound frequency within the duct. Adding mass loaded vinyl around these areas will create a damping barrier for resonating issues. 2 Layers of sheetrock in combination with Mass Loaded Vinyl installed between the joist will significantly weaken sound.

Mass Loaded Vinyl [ Ссылка ]
Duct Neoprene Insulation [ Ссылка ]

2:13 SOUND PROOF INSULATION(Sound Proof Insulation)
Insulate ceiling and wall cavities with Rockwool Sound Proof Insulation. (Rockwool Safe and Sound, Havelock Wool Insulation, Quiet Batt, Owens Corning, or Rockwool Comfort Batt). Cut into the insulation with a drywall knife for smaller crevices in addition to the corners of the ceiling. Soundproofing a room using double insulation will furthermore slow frequencies from resonating inside a cavity. Using a combo of Rockwool Comfortbatt + Safensound has shown great results. The variation in density between the two products helps reduce different frequencies. Using different density in materials is key to the success of any soundproofing treatment. 

2:53 DECOUPLING(Resilient Isolation Channel)
Install Resilient Isolation Clips as well as the Resilient Isolation Chanel. When installing the clips, you need to stager the clips, every 3rd joist. The next row of clips is installed 1 joist over from the last row, stagger these clips every 3rd stud or joist as well. The visual result will be a 45 degree diagonal array of clips, whereas the staggered installation helps disperse vibration transfer. Staggering the resilient isolation clips also promotes even weight distribution for the heavier hanging soundproof drywall. The Resilient Isolation Channel easily clicks into the clips.

Resilient Isolation Clips (Genie) [ Ссылка ]
Resilient Isolation Clips (Resilmount) [ Ссылка ]

3:26 DRYWALL INSTALLATION(Soundproof Drywall, Fine Thread Screws)
The next step is Installing the first layer of drywall or Quietrock onto the resilient channel. After installing the Resilient Isolation Channel and Rockwool Insulation, use fine thread drywall screws to install the drywall. Use the correct length of screws, otherwise the screws will pierce a stud or joist, in this case creating new ways for vibration to transfer directly to the soundproof drywall and possibly compromise the treatment. 

3:48 DRYWALL + GREEN GLUE OR MLV (Quietrock, Green Glue, MLV)
Starting with 2 tubes of Green Glue per 4’ x 8’ sheet of Quietrock. In this case spread the Green Glue onto the surface with a disposable joint taping knife. Otherwise, if you are using 5 gallon bucket of green glue, measure 56 oz with a measuring cup. After installing the second layer of soundproof drywall, the green glue will be forced into all of the screw holes and seams as a result of the pressure, to create an airtight seal. Stagger installation of the second layer of Quietrock to cover seams from the first layer of drywall. Use the correct length of screws to install the drywall in order to not pierce the studs or joists. 

Mass Loaded Vinyl will reduce 10x more vibration than Green Glue, we’ve tested this over and over again and MLV wins every time. Cut the MLV in 24” strips for easier handling. Over lap by 1-2 inches. Install using staples. Protip: use a compressor to save your hands from fatigue.

3:58 LEVEL 5 SKIM COAT
If you want to learn how to soundproof a ceiling, you will first need to learn how to skim coat. Level 5 Skim Coating will add an additional layer of mass to the sound proofing treatment which will encase the drywall seams completely all while furthermore reducing sound transmission.

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